diff --git a/prism/src/hybrid/PrismHybrid.java b/prism/src/hybrid/PrismHybrid.java
index bad55505..bf52be94 100644
--- a/prism/src/hybrid/PrismHybrid.java
+++ b/prism/src/hybrid/PrismHybrid.java
@@ -204,6 +204,8 @@ public class PrismHybrid
 	private static native long PH_ProbUntilInterval(long trans, long odd, long rv, int nrv, long cv, int ncv, long yes, long maybe, int flags);
 	public static DoubleVector ProbUntilInterval(JDDNode trans, ODDNode odd, JDDVars rows, JDDVars cols, JDDNode yes, JDDNode maybe, int flags) throws PrismException
 	{
+		checkNumStates(odd);
+
 		long ptr = PH_ProbUntilInterval(trans.ptr(), odd.ptr(), rows.array(), rows.n(), cols.array(), cols.n(), yes.ptr(), maybe.ptr(), flags);
 		if (ptr == 0) throw generateExceptionForError();
 		return new DoubleVector(ptr, (int)(odd.getEOff() + odd.getTOff()));
@@ -246,6 +248,8 @@ public class PrismHybrid
 	private static native long PH_ProbReachRewardInterval(long trans, long sr, long trr, long odd, long rv, int nrv, long cv, int ncv, long goal, long inf, long maybe, long lower, long upper, int flags);
 	public static DoubleVector ProbReachRewardInterval(JDDNode trans, JDDNode sr, JDDNode trr, ODDNode odd, JDDVars rows, JDDVars cols, JDDNode goal, JDDNode inf, JDDNode maybe, JDDNode lower, JDDNode upper, int flags) throws PrismException
 	{
+		checkNumStates(odd);
+
 		long ptr = PH_ProbReachRewardInterval(trans.ptr(), sr.ptr(), trr.ptr(), odd.ptr(), rows.array(), rows.n(), cols.array(), cols.n(), goal.ptr(), inf.ptr(), maybe.ptr(), lower.ptr(), upper.ptr(), flags);
 		if (ptr == 0) throw generateExceptionForError();
 		return new DoubleVector(ptr, (int)(odd.getEOff() + odd.getTOff()));